Is there a rule of thumb for figuring the Size of vehicles? While this doesn't officially come up a) it seems like a reasonable way to approximate space taken up on the table top if official dimensions aren't available and b) it would make sense to be able to apply the Large/Huge/Gargantuan modifiers to being hit/stomping infantry/whatever; you shouldn't be able to miss a battleship very easily, though you might not be able to hurt it. I am assuming one could approximate from the creature Size table? Is there an approximate conversion from the Toughness table?

Is there a rule of thumb for figuring the Size of vehicles? While this doesn't officially come up a) it seems like a reasonable way to approximate space taken up on the table top if official dimensions aren't available and b) it would make sense to be able to apply the Large/Huge/Gargantuan modifiers to being hit/stomping infantry/whatever; you shouldn't be able to miss a battleship very easily, though you might not be able to hurt it. I am assuming one could approximate from the creature Size table? Is there an approximate conversion from the Toughness table?

Vehicles don't use Size or size modifiers. See this thread for more detail...